Corsair 2GB (1x2GB) DDR3 1333 MHz (PC3 10666) Desktop Memory 1.5V Corsair Memory is optimized for the Microsoft Windows Vista client operating system Online 24/7 Customer Support available at www.asktheramguy.com for your convenience and questions Each memory module is individually tested to give you Peace of Mind that it Will Not Fail, Guaranteed! Lifetime Warranty! 2GB PC310666 1333mhz 9-9-9-24 1.5v